package com.it.tydic.estate.common.security;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.access.SecurityMetadataSource;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;

import javax.annotation.PostConstruct;
import javax.servlet.*;
import java.io.IOException;

@Configuration
public class MyFilterSecurityInterceptor extends AbstractSecurityInterceptor implements Filter {

	@Autowired
	private FilterInvocationSecurityMetadataSource securityMetadataSource;
	
	@Autowired
	private MyAccessDecisionManager myAccessDecisionManager;
	




	@PostConstruct
	public void init(){
		super.setAccessDecisionManager(myAccessDecisionManager);
	}


	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {

		FilterInvocation fi = new FilterInvocation(request, response, chain);
		invoke(fi);
	}

	public void invoke(FilterInvocation fi) throws IOException, ServletException {
		// fi里面有一个被拦截的url
		// 里面调用MyInvocationSecurityMetadataSource的getAttributes(Object
		// object)这个方法获取fi对应的所有权限
		// 再调用MyAccessDecisionManager的decide方法来校验用户的权限是否足够
		InterceptorStatusToken token = super.beforeInvocation(fi);
		try {
			// 执行下一个拦截器
			fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
			
		} finally {
			super.afterInvocation(token, null);
		}
	}
	
	

	@Override
	public void destroy() {
		System.out.println("filter===========================end");
	}

	@Override
	public Class<?> getSecureObjectClass() {
		return FilterInvocation.class;
	}

	@Override
	public SecurityMetadataSource obtainSecurityMetadataSource() {
		return this.securityMetadataSource;
	}


	@Override
	public void init(FilterConfig arg0) throws ServletException {
		System.out.println("filter===========================start");
	}

}
